I can only add two titles (since TCD already mentioned Wings and Lionheart):

ApidyaShadow of the Beast III

But you have to consider there are also a lot of titles which may have been also available on C64, Spectrum, PC and Atari ST but where just leagues beneath the Amiga version, like:

It Came From The Desert,
Super Cars II,
Lotus I & II,
Turrican I & II (of course the C64-versions are technical masterpieces yet it's a totally different experience with the Amiga's graphics and Chris Hülsbeck's music),
Battle Squadron
and many, many more...